As TMZ first reported, while filming on Sunday, an extra for the movie collapsed. Seemingly suffering from heatstroke, the woman fainted during the outdoor shoot. Sources confirm the report to Us Weekly.

Bullock and Thornton, 59, star in the upcoming political dramedy. Based on a 2005 documentary of the same name, it focuses on the 2002 presidential election in Bolivia. Due out in 2016, the movie is directed by David Gordon Green (Pineapple Express) and also stars Scoot McNairy, Anthony Mackie, and Ann Dowd.